should be it

external/duckdb/extension/parquet/include/parquet_column_schema.hpp

@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//                         DuckDB
+//
+// parquet_column_schema.hpp
+//
+//
+//===----------------------------------------------------------------------===//
+#pragma once
+
+#include "duckdb.hpp"
+#include "parquet_types.h"
+
+namespace duckdb {
+
+using duckdb_parquet::FileMetaData;
+struct ParquetOptions;
+
+enum class ParquetColumnSchemaType { COLUMN, FILE_ROW_NUMBER, GEOMETRY, EXPRESSION, VARIANT };
+
+enum class ParquetExtraTypeInfo {
+	NONE,
+	IMPALA_TIMESTAMP,
+	UNIT_NS,
+	UNIT_MS,
+	UNIT_MICROS,
+	DECIMAL_BYTE_ARRAY,
+	DECIMAL_INT32,
+	DECIMAL_INT64,
+	FLOAT16
+};
+
+struct ParquetColumnSchema {
+	ParquetColumnSchema() = default;
+	ParquetColumnSchema(idx_t max_define, idx_t max_repeat, idx_t schema_index, idx_t file_index,
+	                    ParquetColumnSchemaType schema_type = ParquetColumnSchemaType::COLUMN);
+	ParquetColumnSchema(string name, LogicalType type, idx_t max_define, idx_t max_repeat, idx_t schema_index,
+	                    idx_t column_index, ParquetColumnSchemaType schema_type = ParquetColumnSchemaType::COLUMN);
+	ParquetColumnSchema(ParquetColumnSchema parent, LogicalType result_type, ParquetColumnSchemaType schema_type);
+
+	ParquetColumnSchemaType schema_type;
+	string name;
+	LogicalType type;
+	idx_t max_define;
+	idx_t max_repeat;
+	idx_t schema_index;
+	idx_t column_index;
+	optional_idx parent_schema_index;
+	uint32_t type_length = 0;
+	uint32_t type_scale = 0;
+	duckdb_parquet::Type::type parquet_type = duckdb_parquet::Type::INT32;
+	ParquetExtraTypeInfo type_info = ParquetExtraTypeInfo::NONE;
+	vector<ParquetColumnSchema> children;
+
+	unique_ptr<BaseStatistics> Stats(const FileMetaData &file_meta_data, const ParquetOptions &parquet_options,
+	                                 idx_t row_group_idx_p, const vector<duckdb_parquet::ColumnChunk> &columns) const;
+};
+
+} // namespace duckdb